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R-50C-011-5 데이터시트(PDF) 8 Page - Keysight Technologies |
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R-50C-011-5 데이터시트(HTML) 8 Page - Keysight Technologies |
8 / 14 page 08 | Keysight N1911A/N1912A P-Series Power Meters and N1921A/N1922A Wideband Power Sensors - Data Sheet Characteristic Peak Flatness The peak flatness is the flatness of a peak-to-average ratio measurement for various tone-separations for an equal magnitude two- tone RF input. Figure 2 refers to the relative error in peak-to-average ratio measurements as the tone separation is varied. The mea- surements were performed at –10 dBm with power sensors with 1.5 m cable lengths. Figure 2. N192XA Error in peak-to-average measurements for a two-tone input (High, Medium, Low and Off filters) -3.5 -3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0.0 0.5 0 5 10 15 20 25 30 Input tone separation frequency (MHz) High Medium Low (< 500 MHz) Off (> 500 MHz) Off Noise and drift Sensor model Zeroing Zero set Zero drift1 Noise per sample Measurement noise (Free run)2 < 500 MHz > 500 MHz N1921A /N1922A No RF on input 200 nW 200 nW 100 nW 2 μW 50 nW RF present 550 nW 200 nW Measurement average setting 1 2 4 8 16 32 64 128 256 512 1024 Free run noise multiplier 1 0.9 0.8 0.7 0.6 0.5 0.45 0.4 0.3 0.25 0.2 Video BW setting Low 5 MHz Medium 15 MHz High 30 MHz Off Noise per sample multiplier < 500 MHz ≥ 500 MHz 0.5 0.45 1 0.75 2 1.1 1 1 1. Within 1 hour after a zero, at a constant temperature, after 24 hour warm-up of the power meter. This component can be disregarded with Auto-zero mode set to ON. 2. Measured over a one-minute interval, at a constant temperature, two standard deviations, with averaging set to 1. Effect of video bandwidth setting The noise per sample is reduced by applying the meter video bandwidth filter setting (High, Medium or Low). If averaging is implement- ed, this will dominate any effect of changing the video bandwidth. Effect of time-gating on measurement noise The measurement noise on a time-gated measurement will depend on the time gate length. 100 averages are carried out every 1 us of gate length. The Noise-per-Sample contribution in this mode can approximately be reduced by √(gate length/10 ns) to a limit of 50 nW. |
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